Steve Pederson with the Waukesha County Sheriff's Department told WISN 12 News that a suspicious device that resembled a pipe with caps on either end was located by a recycle bin in the Retzer Nature Center, located on Madison Street on the west side of Waukesha.

Peterson said the employees of the center, as well as students on a field trip at the center, were evacuated while the bomb squad assessed the situation.

The device was detonated by the bomb squad and the nature center will reopen Tuesday afternoon.